package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

//若场景只需要日期（如 “用户生日是 2000 年 1 月 1 日”），用 LocalDate；
//若场景需要精确到时分秒的完整时间（如 “订单创建于 2025-09-05 14:30:00”），用 LocalDateTime。
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            //原 begin 对象不会被修改（地址引用不变）；plusDays(1) 会创建一个新的 LocalDateTime 对象（包含加 1 天后的日期时间）；
            //最后将新对象的引用赋值给 begin 变量，此时 begin 变量的引用指向了新对象。
            begin = begin.plusDays(1);//LocalDateTime、LocalDate 等 java.time 包中的类设计为不可变的，即对象一旦创建，其内部的日期时间信息（年、月、日、时、分、秒等）就不能被修改。
            dateList.add(begin);
        }
        String dateString = StringUtils.join(dateList, ",");
        ArrayList<Object> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap<>();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }
        String turnoverString = StringUtils.join(turnoverList, ",");
        return TurnoverReportVO.builder()
                .dateList(dateString)
                .turnoverList(turnoverString)
                .build();
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
//  这是引用比较，检查的是两个变量是否指向内存中的同一个对象（即是否为同一个实例）。
//即使两个 LocalDate 对象表示的是同一个日期（例如都是 2023-10-01），只要它们是不同的对象实例，== 比较的结果也会是 false。
        while (!begin.equals(end)){
             begin = begin.plusDays(1);
             dateList.add(begin);
        }
        List<Integer> newUserList = new ArrayList<>();
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map<Object, Object> map = new HashMap<>();
            map.put("end",endTime);
            Integer totalUser = userMapper.countByMap(map);
            map.put("begin",beginTime);
            Integer newUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .totalUserList(StringUtils.join(totalUserList,","))
                .newUserList(StringUtils.join(newUserList,","))
                .build();
    }

    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)){
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
//        订单总数 直接相加
//        LocalDateTime endTimeSum = LocalDateTime.of(end, LocalTime.MAX);
//        LocalDateTime beginTimeSum = LocalDateTime.of(begin, LocalTime.MAX);
//        Map<String, Object> mapSum = new HashMap<>();
//        mapSum.put("end",endTimeSum);
//        mapSum.put("begin",beginTimeSum);
//        Integer integer = orderMapper.countByMap(mapSum);//订单总数
        Integer totalOrderCountSum = 0;
        Integer validOrderCountSum = 0;
        Integer orderCount;
        Integer validOrderCount;
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map<String, Object> map = new HashMap<>();
            map.put("end",endTime);
            map.put("begin",beginTime);
            orderCount = orderMapper.countByMap(map);
            totalOrderCountSum += orderCount;
            map.put("status",Orders.COMPLETED);
            validOrderCount = orderMapper.countByMap(map);
            validOrderCountSum += validOrderCount;
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }
        Double orderCompletionRate = 0.0;
        if (totalOrderCountSum != 0){
            orderCompletionRate = validOrderCountSum * 1.0 / totalOrderCountSum;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .orderCompletionRate(orderCompletionRate)
                .orderCountList(StringUtils.join(orderCountList,","))
                .totalOrderCount(totalOrderCountSum)
                .validOrderCount(validOrderCountSum)
                .validOrderCountList(StringUtils.join(validOrderCountList,","))
                .build();

    }

    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
//        传统
//        List<String> nameList = new ArrayList<>();
//        List<Integer> numberList = new ArrayList<>();
//        for (GoodsSalesDTO dto : salesTop10) {
//            nameList.add(dto.getName());
//            numberList.add(dto.getNumber());
//        }
//        todo 黑马的方式看不懂
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ",");
        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(nameList,","))
                .numberList(StringUtils.join(numberList,","))
                .build();
    }

    @Override
    public void exportBusinessData(HttpServletResponse response) {
        log.info("第一种方式获取前30天日期:{}",LocalDateTime.now().minusDays(30).with(LocalTime.MIN));//LocalDateTime
        log.info("第二种方式获取前30天日期:{}",LocalDate.now().atStartOfDay());//LocalDateTime
//        1.查询数据库获取最近30天的数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);//是前一天,如果以减去30天到今天,那么天数是31天
//        概览数据
        BusinessDataVO businessDataVO = workspaceService
                .getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
//      2.通过POI将数据写入Excel文件  todo 再去看看韩顺平的获取
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");//todo 前面不要加/吗??
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);//基于模板文件创建一个新的Excel文件
            XSSFSheet sheet = excel.getSheet("Sheet1");
            sheet.getRow(1).getCell(1).setCellValue("时间:" + dateBegin + "至" + dateEnd);
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());
            int x = 7;
            while (!dateBegin.equals(dateEnd)){
                BusinessDataVO businessData =
                        workspaceService.getBusinessData(dateBegin.atStartOfDay(), dateBegin.atStartOfDay().with(LocalTime.MAX));
                row = sheet.getRow(x);
                row.getCell(1).setCellValue(dateBegin.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
                dateBegin = dateBegin.plusDays(1);//原有的对象不会改变
                x += 1;
            }
            //        3.通过输出流将Excel文件下载到客户端浏览器,todo 文件下载
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);
            excel.close();
            out.close();
            in.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
